integ/monitoring/collectd-extensions/src/ntpq.conf

<Plugin "threshold">
  <Plugin "ntpq">
    <Type "absolute">
      Instance "reachable"
      Persist true
      PersistOK true
      WarningMin 1
      FailureMin 0
      Hits 2
      Invert false
    </Type>
  </Plugin>
</Plugin>